125 lines
4.2 KiB
Rust
125 lines
4.2 KiB
Rust
//
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// imag - the personal information management suite for the commandline
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// Copyright (C) 2015-2018 Matthias Beyer <mail@beyermatthias.de> and contributors
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//
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// This library is free software; you can redistribute it and/or
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// modify it under the terms of the GNU Lesser General Public
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// License as published by the Free Software Foundation; version
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// 2.1 of the License.
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//
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public
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// License along with this library; if not, write to the Free Software
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// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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//
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use error::InteractionError as IE;
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use error::InteractionErrorKind as IEK;
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use error::ResultExt;
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use toml::Value;
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use rustyline::{Config, Editor};
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pub struct Readline {
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editor: Editor,
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history_file: PathBuf,
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prompt: String,
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}
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impl Readline {
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pub fn new(rt: &Runtime) -> Result<Readline> {
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let c = rt.config().ok_or(IEK::NoConfigError)?;
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let histfile = c.lookup("ui.cli.readline_history_file").ok_or(IEK::ConfigError)?;
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let histsize = c.lookup("ui.cli.readline_history_size").ok_or(IEK::ConfigError)?;
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let histigndups = c.lookup("ui.cli.readline_history_ignore_dups").ok_or(IEK::ConfigError)?;
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let histignspace = c.lookup("ui.cli.readline_history_ignore_space").ok_or(IEK::ConfigError)?;
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let prompt = c.lookup("ui.cli.readline_prompt").ok_or(IEK::ConfigError)?;
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let histfile = histfile
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.as_str()
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.map(PathBuf::from)
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.ok_or(IE::from_kind(IEK::ConfigTypeError))
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.chain_err(|| IEK::ConfigError)
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.chain_err(|| IEK::ReadlineError)?;
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let histsize = histsize
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.as_int()
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.ok_or(IE::from_kind(IEK::ConfigTypeError))
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.chain_err(|| IEK::ConfigError)
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.chain_err(|| IEK::ReadlineError)?;
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let histigndups = histigndups
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.as_bool()
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.ok_or(IE::from_kind(IEK::ConfigTypeError))
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.chain_err(|| IEK::ConfigError)
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.chain_err(|| IEK::ReadlineError)?;
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let histignspace = histignspace
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.as_bool()
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.ok_or(IE::from_kind(IEK::ConfigTypeError))
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.chain_err(|| IEK::ConfigError)
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.chain_err(|| IEK::ReadlineError)?;
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let prompt = prompt
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.as_str()
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.ok_or(IE::from_kind(IEK::ConfigTypeError))
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.chain_err(|| IEK::ConfigError)
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.chain_err(|| IEK::ReadlineError)?;
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let config = Config::builder().
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.max_history_size(histsize)
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.history_ignore_dups(histigndups)
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.history_ignore_space(histignspace)
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.build();
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let mut editor = Editor::new(config);
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if !histfile.exists() {
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let _ = File::create(histfile.clone())
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.chain_err(|| IEK::ReadlineHistoryFileCreationError)?;
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}
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let _ = editor.load_history(&histfile).chain_err(|| ReadlineError)?;
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Ok(Readline {
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editor: editor,
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history_file: histfile,
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prompt: prompt,
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})
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}
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pub fn read_line(&mut self) -> Result<Option<String>> {
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use rustyline::ReadlineError;
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use libimagutil::warn_result::*;
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match self.editor.readline(&self.prompt) {
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Ok(line) => {
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self.editor.add_history_line(&line);
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self.editor
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.save_history(&self.history_file)
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.map_warn_err_str(|e| format!("Could not save history file {} -> {:?}",
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self.history_file.display(), e));
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return line;
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},
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Err(ReadlineError::Interrupted) => {
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info!("CTRL-C");
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Ok(None)
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},
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Err(ReadlineError::Eof) => {
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info!("CTRL-D");
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Ok(None)
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},
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Err(err) => Err(err).map_err_into(ReadlineError),
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}
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}
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}
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